To me one of the real values of Job Slinger is in the 'stale' posts. When I go to a job board where only 'live' jobs are listed I will never know what other opportunities were available that may become available again. There are literally a couple of companies that I watch like a hawk to make sure I get the jobs off the job board ASAP so that others are not even aware they existed. If I go to a job board and see a job I want with a company I am not registered with, by the time I register, the job is likely to be gone. If I see the 'stale' posting I at least know I need to get registered for next round.
What many shoppers find valuable about JS+ is that they can get instant notification on their cell phones of SASSIE shops as they post. If I found 1) that my best jobs were self assigns off of SASSIE and 2) that I was willing to pay extra for email and internet service to my cell phone and 3) that it really was profitable to shell out $4 per month for JS+, then I might consider it. But I find that 1) is not true and therefore 2) and 3) become irrelevant expenses.